What Aging Does
The numbers tell you what to hold. This page is about what those numbers are for — what is actually happening inside a wheel across the months when, from the outside, absolutely nothing appears to be happening at all.
The short version, and it is the thing I most wish somebody had told me thirty years ago:
Aging is not storage. Storage holds a thing still. Aging is a process you are hosting, and your entire job is to hold the conditions steady while three different clocks run at three different speeds.
That distinction is why a refrigerator fails. A fridge is very good at storage. It is holding the cheese still — and a cheese held still just gets old.
The three clocks
Everything that happens to a wheel between the press and the plate is one of three processes, and they do not run at the same rate.
Water leaves. From the day it goes on the shelf, the wheel is losing moisture to the air. This is the fastest of the three, the only one you can measure with a scale, and the one that sets the terms for the other two.
Protein breaks down. Proteolysis takes the casein network apart into peptides and free amino acids — which is texture becoming softer and flavour becoming deeper, at the same time and by the same mechanism.
Fat breaks down. Lipolysis liberates free fatty acids, which is where sharpness and piquancy come from. This is usually the slowest, and it is the one that turns from an asset into a fault if it runs too far — the far end of lipolysis is rancid.
The science wing covers the second and third properly and I’m not going to restate it here. What the cave is about is the first one, because water is the master control on the other two.
Water is the one you can watch
Here is the part that took me embarrassingly long to internalise. A wheel is lighter every week, and that weight is the aging.
Moisture evaporates from the surface, and moisture from the interior migrates outward to replace it. So a drying rind is not a separate thing that happens to the outside of the cheese — it is the visible end of a gradient running all the way to the centre.
Three consequences follow, and they explain most of what a cave asks of you:
Everything concentrates. Salt, fat, protein, flavour compounds — the water goes and the rest stays, so the cheese gets more of itself as it ages. It also gets firmer, which is why “hard” and “aged” are so nearly the same word in practice.
The gradient is why you turn wheels. Left alone, the face on the shelf stays wet and the face in the air dries. Turning is not a ritual; it is how you keep the gradient symmetrical.
And humidity is not comfort, it is a rate control. At 90% RH the wheel loses water slowly enough that the interior can keep up with the surface. Drop to 70% and the surface dries far faster than moisture can migrate out to it — the rind hardens into a shell, the interior stays wet behind it, and the wheel cracks, usually from the inside where you cannot see it until you cut.
⚠ And a number I am deliberately not printing
There is real published work on this. A 2020 paper in the Journal of Dairy Science modelled weight loss across 1,211 model cheeses made from Brown Swiss milk in Trento province and ripened 60 days at 15 °C and 85% RH — and the shape of its answer is the useful part: weight loss is modelled as a two-compartment first-order kinetic, not a straight line. Fast at first, then progressively slower as the rind forms and starts resisting the loss it caused.
I have not printed a percentage, because I could not read the paper’s own figures — it is paywalled, and the abstract gives the model rather than the numbers. And a percentage would be close to useless anyway without the wheel it came from: loss is driven by surface-to-volume ratio, so a half-pound button and a forty-kilogram wheel are not comparable. That is the whole reason alpine cheeses are enormous — less surface per pound, less loss, better keeping.
What is worth taking from it: the first weeks are when a wheel changes fastest. If your humidity is going to be wrong, that is the expensive time for it to be wrong.
Where it happens: the rind, or everywhere
The other thing aging “does” is decided before the wheel ever reaches the shelf, and it determines what your hands will be doing for the next few months.
Surface-ripened cheeses — bloomy and washed rinds — are worked on from the outside in by organisms living on the rind, and the ripening front moves inward. That is why they are made small and flat, and why they want frequent attention: the thing doing the work is on the outside where you can help it or ruin it.
Interior-ripened cheeses — cheddar, alpine, the grating cheeses — ripen throughout, because the enzymes are distributed through the paste. They ask much less of you week to week, and much more of you in patience.
The science wing has the mechanism; the practical version is that the first kind is a schedule and the second kind is a wait. My own cave holds both, and they are genuinely different hobbies happening on adjacent shelves.
What you are actually steering
The honest inventory of the affineur’s controls is short, and shorter than most people expect:
| Lever | What it changes |
|---|---|
| Temperature | The rate of everything. Low fifties |
| Humidity | How fast water leaves — so, how fast the rind forms and how far the paste dries |
| Air movement | Whether the surface evaporates evenly, and whether mould gets a still pocket to exploit |
| Handling | Turning, brushing, washing — symmetry, and who lives on the rind |
| Time | The only one with no substitute |
That is the list. Everything else was decided in the vat: the moisture you left in the curd, the salt, the pH, the cultures. The cave does not fix a cheese — it develops the one you made. A wheel that came out of the press too wet, too acid or under-salted will express that fault more clearly at six months than it did at one week, not less.
The unglamorous part, which is money and space
There is a reason the great aged cheeses came out of institutions rather than households, and the monasteries page puts it plainly: aging is a capital problem before it is a technical one. A wheel on a shelf is milk you have already paid for, work you have already done, and space you cannot use for anything else — earning nothing for a year or two, and capable of failing at any point in it.
That is not an abstraction. It is why the Italians built a bank that lends against wheels of Parmigiano and stores the collateral in a vault, and it is the real reason a home cheesemaker’s shelf tends to fill with things that are ready in eight weeks. The long-aged wheel is the expensive hobby inside the hobby.
I mention it because the technical advice — hold 53 °F, hold 90% — makes aging sound like an engineering problem, and mine mostly is now, since I built the machinery to hold those numbers without my attention. The part that is actually hard is committing a wheel to a year, and then leaving it alone for a year.
Next: flipping, brushing and washing — the three things your hands do on the shelf, and how to tell which one a cheese is asking for.
Sources
- Proteolysis, lipolysis, the crystals and the inside-out/outside-in distinction are covered with their own sources on the ripening page.
- Weight loss during ripening modelled as a two-compartment first-order kinetic, 1,211 model cheeses from Brown Swiss milk in Trento province, 60 days at 15 °C and 85% RH: Bittante et al., “Modeling weight loss of cheese during ripening and the influence of dairy system, parity, stage of lactation, and composition of processed milk,” Journal of Dairy Science 103(8), 2020 — https://www.journalofdairyscience.org/article/S0022-0302(20)30406-9/fulltext. ⚠ Abstract only; the full text is paywalled, which is why no percentage figure appears above.
- Target temperature, humidity and airflow: New England Cheesemaking Supply Company, “How to Make a Cheese Cave” — https://cheesemaking.com/blogs/learn/how-to-make-a-cheese-cave
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